Always give simple circular rrects a shot at being directly blurred on the GPU

src/effects/SkBlurMaskFilter.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
 #include "SkGpuBlurUtils.h"
@@ skipping 1301 matching lines @@
 
 bool SkBlurMaskFilterImpl::canFilterMaskGPU(const SkRRect& devRRect,
                                             const SkIRect& clipBounds,
                                             const SkMatrix& ctm,
                                             SkRect* maskRect) const {
     SkScalar xformedSigma = this->computeXformedSigma(ctm);
     if (xformedSigma <= 0) {
         return false;
     }
 
-    // We always do circles on the GPU
-    if (!devRRect.isCircle()) {
+    // We always do circles and simple circular rrects on the GPU
+    if (!devRRect.isCircle() && !devRRect.isSimpleCircular()) {
         static const SkScalar kMIN_GPU_BLUR_SIZE  = SkIntToScalar(64);
         static const SkScalar kMIN_GPU_BLUR_SIGMA = SkIntToScalar(32);
 
         if (devRRect.width() <= kMIN_GPU_BLUR_SIZE &&
             devRRect.height() <= kMIN_GPU_BLUR_SIZE &&
             xformedSigma <= kMIN_GPU_BLUR_SIGMA) {
             // We prefer to blur small rects with small radii on the CPU.
             return false;
         }
     }
@@ skipping 94 matching lines @@
     } else {
         str->append("None");
     }
     str->append("))");
 }
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END